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Distribution Center using Cascade CO2 and secondary fluid

Distribution Center using cascade CO2 and secondary fluid

With a supermarket chain in the interior of São Paulo, Brazil, Covabra has approximately 15 stores that vary between 1000 and 5000 m2. The Covabra network built a CD in Sumaré in the interior of São Paulo to supply its stores for planning, design and execution of the refrigeration system. It had all the knowledge and technology employed by Thermo Industrial, located in Belo Horizonte, with presence all over Brazil.

Thermo Industrial has gained Güntner's know-how which, in addition to providing equipment, has also contributed its knowledge of CO2 and secondary fl uid, as these applications require more rigorous requirements for designing equipment.

For this project, 25 Güntner air coolers were used, which were divided into the air conditioning, cooling and freezing chambers, as well as 2 air condensers.

Project concept

In this project three different types of fl uids were applied: CO2, Propylene Glycol and R134a, with the purpose of:
- Reduce energy consumption;
- Ensure employee safety;
- Avoid product contamination;
- Minimize damage to the environment as much as possible.

CO2 was used in air coolers for application in the storage of frozen products. The option to use this fl uid occurred due to its high performance in terms of operating cost and also because it is a fluid with very low ecological impacts.

Propylene glycol was used in air coolers for application in air conditioning and storage of various cooled products. The option to use this fl uid was due to the good performance compared to other secondary fl uids, besides having low toxicity since it has food grade.

R134a was used to ensure the cooling of propylene glycol and to absorb the heat generated by the CO2 system. The Güntner and Thermo Industrial engineering companies have jointly developed a customized design, with very accurate analysis in terms of thermal load and air flow. With this, it was possible to substantially reduce both initial cost and operating cost.

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